Dr. Ivan Sascha Sheehan extends his congratulations to Dr. Daniel Gerstein, the Under Secretary for Science and Technology at the Department of Homeland Security, on the publication of his book Bioterror in the 21st Century and appreciates the kind words in the acknowledgements section of his new book. Dr. Gerstein’s prior service as the Principal Director for Countering Weapons of Mass Destruction in the Office of the Secretary of Defense makes him uniquely qualified to speak to the challenges of biodefense in the 21st century. Please read this important book on the bioterror threat.